how to found on line my serial number from aperture 3 i ave remove mi Disk dur from a macbookpro (broken) to a new second hand Macbookpro OS X 10.8.5 exacly the same but aperture ask me the serial nbr to use it again?

You cannot find the serial number online. Try to find your box with the installer media.

If you cannot find your copy of the serial number, contact Apple for a replacement serial number. See this link:

Pro Application Replacement Serial Numbers http://support.apple.com/kb/HT200108

If your Aperture 3 version is an upgrade to Apeture 2, you will need the Aperture 2 serial number as well.

You're welcome 🙂